High in the mountains of some country, the evil wizard Grindelwald was holding a meeting with his top followers. You could tell he was evil because there were no refreshments. By the way, his followers were called Death Eaters because it turns out Grindelwald used that name first. This is canon now.
"Blast that Newt Scamander!" he snarled, slamming his fist on the table. "He and those fantastic beasts of his have made a fool out of me for the last time!"
"What are we going to do about it?" asked Credence angstily.
"Well, we'll just have to kill him before he can foil another of our diabolical schemes," said Grindelwald. "At this point, it's practically self-defense."
"Yes, and then we'll finally be able to move on to our grand plan," agreed Vinda Rosier.
"You mean winning Jacob back?" asked Queenie.
"Uh... sure," Vinda lied nefariously.
"Wait, I've got it!" declared Grindelwald. "We'll capture an ancient weapon that will enable us to destroy Newt Scamander and his precious beasts for good. The world has dismissed it as a myth, but soon we will possess... the Toenail of Icklibõgg!"